: These obscured hash-named files are frequently password-protected. Check the source where you found the link (the forum post, text file, or site description) for the password. Do you have the other numbered parts of this archive, or
: This means part05.rar (or another part) was damaged during download. You will need to redownload that specific part. b54d07bc44b9443b8b8114bb8be5a7e4.part05.rar
Look for other files with the same hash name ( b54d... ) ending in .part01.rar , .part02.rar , and so on. and so on.